It is only true in the sense that any numeric base, expressed in that base, is represented with the symbol "10".
Confusing? Let's clarify that.
Hexadecimal numbers use sixteen as the base. But how do you express the value sixteen in hexadecimal? Quite easy, it would be written as "10". The same is true in any other base. For example, in binary (base two), the value two is expressed as "10". In octal (base eight), the value eight is expressed as "10". In decimal (our familiar base ten), the value ten is expressed as "10". No matter what base you work in, the base itself will always be expressed as "10".
That however is not the same thing as saying that hexadecimal numbers are based on the number ten. That is incorrect. Hexadecimal numbers use the base sixteen.
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The decimal number 11 is equal to the hexadecimal number B.
Probably the most common diagram is the number line.
The two number lines are referred to as axes, the plural of axis. Normally the Cartesian system has positive and negative numbers on an x-axis (horizontal line) and a y-axis (vertical line).
Imaginary and complex numbers are an extension of the Real Number system. They are not called unreal. An imaginary number is a non-existent number, like the square root of a negative number. For example, the square root of -4 is 2i (i stands for imaginary). There are also complex numbers, which are defined as the sum of a real number and an imaginary number (e.g. 4 + 3i). An imaginary number does not exist, but can nevertheless be useful in certain applications. An imaginary number is any number that is the product of a real number and the square root of negative one (-1). The square root of -1 is the "unit" of the set of imaginary numbers, and is referred to as "i". As you know, negative numbers cannot have square roots, and so the square root of any negative number is "imaginary". There are also "complex numbers", which are the sum of a real number and an imaginary number. For example 3 + 2i.
For the decimal number system . . . 'Ten'. For the binary number system . . . 'Two' For the octal number system . . . 'Eight' For the hexidecimal number system . . . 'Sixteen' . . etc.